<template>
  <div class="score-case">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item, index) in list" :key="item.id">
            <td>{{ index + 1 }}</td>
            <td>{{ item.subject }}</td>
            <td :class="item.score < 60 ? 'red' : ''">{{ item.score }}</td>
            <td>{{ dateFormat(item.date) }}</td>
            <td><a href="#" @click.prevent="del(item.id)">删除</a></td>
          </tr>
        </tbody>
        <!-- <tbody >
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody> -->
        <tfoot>
          <tr>
            <td colspan="5">
              <span>总分：{{ total }}</span>
              <span style="margin-left: 50px">平均分：{{ avg }}</span>
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
    <div class="form">
      <div class="form-item">
        <div class="label">科目：</div>
        <div class="input">
          <input type="text" placeholder="请输入科目" v-model.trim="subject" />
        </div>
      </div>
      <div class="form-item">
        <div class="label">分数：</div>
        <div class="input">
          <input type="text" placeholder="请输入分数" v-model.number="score" />
        </div>
      </div>
      <div class="form-item">
        <div class="label"></div>
        <div class="input">
          <button class="submit" @click="add">添加</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// 导入dayjs
import dayjs from "dayjs";
export default {
  name: "ScoreCase",
  data() {
    return {
      list: JSON.parse(localStorage.getItem('list')) || [],
      subject: "",
      score: "",
    };
  },
  methods: {
    dateFormat(d) {
      // dayjs(原始时间日期).format('你需要的格式')
      return dayjs(d).format("YYYY-MM-DD HH-mm-ss");
    },
    del(id) {
      this.list = this.list.filter((item) => item.id !== id);
    },
    add() {
      this.list.push({
        id: Date.now(),
        date: new Date(),
        subject: this.subject,
        score: this.score,
      });
      this.subject = this.score = "";
    },
  },
  computed: {
    // 计算总分
    total() {
      return this.list.reduce((t, c) => {
        return t + c.score;
      }, 0);
    },
    // 计算平均分(总分/总科目数量)
    avg() {
      return (this.total / this.list.length).toFixed(2);
    },
  },
  watch: {
    list: {
      handler(val){
        localStorage.setItem('list',JSON.stringify(val))
      },
      deep:true
    }
  }
};
</script>

<style>
.score-case {
  width: 1000px;
  margin: 50px auto;
  display: flex;
}
.score-case .table {
  flex: 4;
}
.score-case .table table {
  width: 100%;
  border-spacing: 0;
  border-top: 1px solid #ccc;
  border-left: 1px solid #ccc;
}
.score-case .table table th {
  background: #f5f5f5;
}
.score-case .table table tr:hover td {
  background: #f5f5f5;
}
.score-case .table table td,
.score-case .table table th {
  border-bottom: 1px solid #ccc;
  border-right: 1px solid #ccc;
  text-align: center;
  padding: 10px;
}
.score-case .table table .red {
  color: red;
}
.score-case .table .none {
  height: 50px;
  line-height: 100px;
  color: #999;
}
.score-case .form {
  flex: 1;
  padding: 20px;
}
.score-case .form .form-item {
  display: flex;
  margin-bottom: 20px;
  align-items: center;
}
.score-case .form .form-item .label {
  width: 60px;
  text-align: right;
  font-size: 14px;
}
.score-case .form .form-item .input {
  flex: 1;
}
.score-case .form .form-item input,
.score-case .form .form-item select {
  appearance: none;
  outline: none;
  border: 1px solid #ccc;
  width: 200px;
  height: 40px;
  box-sizing: border-box;
  padding: 10px;
  color: #666;
}
.score-case .form .form-item input::placeholder {
  color: #666;
}
.score-case .form .form-item .cancel,
.score-case .form .form-item .submit {
  appearance: none;
  outline: none;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 10px;
  margin-right: 10px;
  font-size: 12px;
  background: #ccc;
}
.score-case .form .form-item .submit {
  border-color: #069;
  background: #069;
  color: #fff;
}
</style>
